9 Commits (6c0ac8bef3a4f90e311a1cd8346f6e63cb57ac9e)

Author	SHA1	Message	Date
Maisem Ali	c3a8e63100	util/linuxfw: add additional nftable detection logic ... We were previously using the netlink API to see if there are chains/rules that already exist. This works fine in environments where there is either full nftable support or no support at all. However, we have identified certain environments which have partial nftable support and the only feasible way of detecting such an environment is to try to create some of the chains that we need. This adds a check to create a dummy postrouting chain which is immediately deleted. The goal of the check is to ensure we are able to use nftables and that it won't error out later. This check is only done in the path where we detected that the system has no preexisting nftable rules. Updates #5621 Updates #8555 Updates #8762 Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Maisem Ali	fbfee6a8c0	cmd/containerboot: use linuxfw.NetfilterRunner ... This migrates containerboot to reuse the NetfilterRunner used by tailscaled instead of manipulating iptables rule itself. This has the added advantage of now working with nftables and we can potentially drop the `iptables` command from the container image in the future. Updates #9310 Co-authored-by: Irbe Krumina <irbe@tailscale.com> Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
Maisem Ali	05a1f5bf71	util/linuxfw: move detection logic ... Just a refactor to consolidate the firewall detection logic in a single package so that it can be reused in a later commit by containerboot. Updates #9310 Signed-off-by: Maisem Ali <maisem@tailscale.com>	1 year ago
James Tucker	ba6ec42f6d	util/linuxfw: add missing input rule to the tailscale tun ... Add an explicit accept rule for input to the tun interface, as a mirror to the explicit rule to accept output from the tun interface. The rule matches any packet in to our tun interface and accepts it, and the rule is positioned and prioritized such that it should be evaluated prior to conventional ufw/iptables/nft rules. Updates #391 Fixes #7332 Updates #9084 Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
James Tucker	2066f9fbb2	util/linuxfw: fix crash in DelSNATRule when no rules are found ... Appears to be a missing nil handling case. I looked back over other usage of findRule and the others all have nil guards. findRule returns nil when no rules are found matching the arguments. Fixes #9553 Signed-off-by: James Tucker <james@tailscale.com>	1 year ago
Craig Rodrigues	8683ce78c2	client/web, clientupdate, util/linuxfw, wgengine/magicsock: Use %v verb for errors ... Replace %w verb with %v verb when logging errors. Use %w only for wrapping errors with fmt.Errorf() Fixes: #9213 Signed-off-by: Craig Rodrigues <rodrigc@crodrigues.org>	1 year ago
Brad Fitzpatrick	1b223566dd	util/linuxfw: fix typo in unexported doc comment ... And flesh it out and use idiomatic doc style ("whether" for bools) and end in a period while there anyway. Updates #cleanup Change-Id: Ieb82f13969656e2340c3510e7b102dc8e6932611 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	1 year ago
KevinLiang10	b040094b90	util/linuxfw: reorganize nftables rules to allow it to work with ufw ... This commit tries to mimic the way iptables-nft work with the filewall rules. We follow the convention of using tables like filter, nat and the conventional chains, to make our nftables implementation work with ufw. Updates: #391 Signed-off-by: KevinLiang10 <kevinliang@tailscale.com>	1 year ago
KevinLiang10	a3c7b21cd1	util/linuxfw: add nftables support ... This commit adds nftable rule injection for tailscaled. If tailscaled is started with envknob TS_DEBUG_USE_NETLINK_NFTABLES = true, the router will use nftables to manage firewall rules. Updates: #391 Signed-off-by: KevinLiang10 <kevinliang@tailscale.com>	1 year ago